Overload operators for `Rect + Margin`, `Rect - Margin` etc #10402

Job	Run time
Check wasm32 + wasm-bindgen	2m 30s
Format + check + test	6m 8s
android	22s
cargo-deny aarch64-apple-darwin	39s
cargo-deny aarch64-linux-android	48s
Check Windows	2m 10s
cargo-deny i686-pc-windows-gnu	38s
cargo-deny i686-pc-windows-msvc	42s
cargo-deny i686-unknown-linux-gnu	43s
cargo-deny wasm32-unknown-unknown	39s
cargo-deny x86_64-apple-darwin	38s
cargo-deny x86_64-pc-windows-gnu	39s
cargo-deny x86_64-pc-windows-msvc	44s
cargo-deny x86_64-unknown-linux-gnu	37s
cargo-deny x86_64-unknown-linux-musl	38s
cargo-deny x86_64-unknown-redox	37s
	19m 12s

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